diff --git a/Doc/lib/libunix.tex b/Doc/lib/libunix.tex
index 47ed02994c2..361aa164796 100644
--- a/Doc/lib/libunix.tex
+++ b/Doc/lib/libunix.tex
@@ -19,7 +19,7 @@ some or many variants of it.  Here's an overview:
 --- The group database (\code{getgrnam()} and friends).
 
 \item[crypt]
---- The \code{crypt()} function used to check Unix passwords.
+--- The \code{crypt()} function used to check \UNIX{} passwords.
 
 \item[dbm]
 --- The standard ``database'' interface, based on \code{ndbm}.
@@ -40,6 +40,6 @@ some or many variants of it.  Here's an overview:
 --- A file-like object with support for locking.
 
 \item[syslog]
---- An interface to the Unix \code{syslog} library routines.
+--- An interface to the \UNIX{} \code{syslog} library routines.
 
 \end{description}
diff --git a/Doc/libunix.tex b/Doc/libunix.tex
index 47ed02994c2..361aa164796 100644
--- a/Doc/libunix.tex
+++ b/Doc/libunix.tex
@@ -19,7 +19,7 @@ some or many variants of it.  Here's an overview:
 --- The group database (\code{getgrnam()} and friends).
 
 \item[crypt]
---- The \code{crypt()} function used to check Unix passwords.
+--- The \code{crypt()} function used to check \UNIX{} passwords.
 
 \item[dbm]
 --- The standard ``database'' interface, based on \code{ndbm}.
@@ -40,6 +40,6 @@ some or many variants of it.  Here's an overview:
 --- A file-like object with support for locking.
 
 \item[syslog]
---- An interface to the Unix \code{syslog} library routines.
+--- An interface to the \UNIX{} \code{syslog} library routines.
 
 \end{description}